We weren't fully using InsertChangeCompressedToTagged and similar, which
in turn made it so that we were using more NewNode. This CL unifies the
way that we generate the insertion of Change nodes regarding decompressions.

Dribe-by fix: make InsertChangeCompressedPointerToTaggedPointer actually
use Pointer.

Bug: v8:7703
Change-Id: I1d8835a54914cdab93f652ff17e39e8271a585df
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1741661Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63154}